A data warehouse is a subject oriented, integrated, non-volatile, and time-variant collection of data to support management decisions
— Bill Inmon
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| Definition of a Data Warehouse |
Data is categorized and stored by business subject rather than by application.
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| Subject-Oriented |
Integrated
Data on a given subject is collected from various sources and stored once.
Time-Variant
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| Time-Variant |
Data is stored as a series of snapshots, each representing a period of time
Non-volatile
Typically data in the data warehouse is not updated or deleted.
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| Non-Volatile |
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